Re: Segmentation fault

Hi everybody,

I'm using Ubuntu 8.04 (Hardy), up to date.

I think that you should run your script with gdb:
>
> $ gdb python
> gdb> set args yourscript.py
> gdb> run
> [it crashes]
> gdb> bt full
>
> And post the result.
>

To be clear, here is the python script I used with gdb :

import netsnmp
>
> qosType = "0"
> profileNb = "17"
> value = "rbQoSProfileType"
>
> oid = netsnmp.Varbind(value, profileNb, qosType)
> result = netsnmp.snmpget(oid, DestHost = "10.0.0.1", Community="private",
> Version = 2)
> print ("%s")  %(result)
>

and here is what I did with gdb :

mesh@sumac-clusterhead-1:~$ gdb python
> GNU gdb 6.8-debian
> Copyright (C) 2008 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <
> http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "i486-linux-gnu"...
> (no debugging symbols found)
> (gdb) set args test2.py
> (gdb) run
> Starting program: /usr/bin/python test2.py
> (no debugging symbols found)
> (no debugging symbols found)
> (no debugging symbols found)
> [Thread debugging using libthread_db enabled]
> (no debugging symbols found)
> (no debugging symbols found)
> (no debugging symbols found)
> (no debugging symbols found)
> [New Thread 0xb7df18c0 (LWP 6839)]
> (no debugging symbols found)
> (no debugging symbols found)
> (no debugging symbols found)
> (no debugging symbols found)
> (no debugging symbols found)
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 0xb7df18c0 (LWP 6839)]
> 0xb7e66403 in strchrnul () from /lib/tls/i686/cmov/libc.so.6
> (gdb) bt full
> #0  0xb7e66403 in strchrnul () from /lib/tls/i686/cmov/libc.so.6
> No symbol table info available.
> #1  0xb7e30259 in vfprintf () from /lib/tls/i686/cmov/libc.so.6
> No symbol table info available.
> #2  0xb7e54c04 in vsnprintf () from /lib/tls/i686/cmov/libc.so.6
> No symbol table info available.
> #3  0xb7e393a5 in snprintf () from /lib/tls/i686/cmov/libc.so.6
> No symbol table info available.
> #4  0xb7ce0d15 in ?? ()
>    from /usr/lib/python2.5/site-packages/netsnmp/client_intf.so
> No symbol table info available.
> #5  0xb7ce3bc6 in ?? ()
>    from /usr/lib/python2.5/site-packages/netsnmp/client_intf.so
> No symbol table info available.
> #6  0x080c9ab3 in PyEval_EvalFrameEx ()
> No symbol table info available.
> #7  0x080c96e5 in PyEval_EvalFrameEx ()
> No symbol table info available.
> #8  0x080cb1f7 in PyEval_EvalCodeEx ()
> No symbol table info available.
> #9  0x080c93fe in PyEval_EvalFrameEx ()
> No symbol table info available.
> #10 0x080cb1f7 in PyEval_EvalCodeEx ()
> ---Type <return> to continue, or q <return> to quit---
> No symbol table info available.
> #11 0x080cb347 in PyEval_EvalCode ()
> No symbol table info available.
> #12 0x080ea818 in PyRun_FileExFlags ()
> No symbol table info available.
> #13 0x080eaab9 in PyRun_SimpleFileExFlags ()
> No symbol table info available.
> #14 0x08059335 in Py_Main ()
> No symbol table info available.
> #15 0x080587f2 in main ()
> No symbol table info available.
> (gdb)
>




> Which distribution are you using?  Adding debug package for libsnmp will
> help if they  are available. Or maybe you use your  own libsnmp. In this
> case, try to compile it  unstripped. I don't remember, but which version
> do you use?
>
> Maybe you have the same bug as here:
>  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=497656
>


    Have you tried applying the patch mentioned in that bug report?
>     It's a one-line change to the file 'python/netsnmp/client_intf.c'
>       (Though you would also need to recompile/install the python module)
>
>     Dave
>

I'm using the library libsnmp-python available in the depositories of
Ubuntu. The version of this library is 5.4.1~dfsg-4ubuntu4.2 . I tried to
see my client.py file but I didn't find it. However, it is in the sources of
the net-snmp library available on the website of net-snmp
http://www.net-snmp.org/download.html. I downloaded the lastest sources :
https://sourceforge.net/projects/net-snmp/files/net-snmp/net-snmp-5.4.2.1.zip/download.
In these sources, the client.py file is up-to-date compared to the bug
report (the line 341 has been changed).
So, I tried to compile these sources (./configure, then make). But I had a
problem with the make, it told me it wasn't able to find the perl library.
So I made a link between the library it was looking for and the library
installed (libperl.so.5.8.8).
After that I recompiled, ./configure and make, but I had another problem
with the make. It's a little bit difficult for me to explain this problem,
so I posted the result of the make (that I put in a file to be able to read
it after) on pastebin.ca. Here it is : http://pastebin.ca/1489423

I try to be as clear as I can, but maybe I'm not, so ask me if you don't
understand.

Thank you very much

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